使用PHP调用OpenAI ChatGPT API接口

OpenAI的PHP SDK实现如下，其中ChatGPT使用的模型为gpt-3.5-turbo，如果已经有ChatGPT Plus，并申请到GPT-4的API权限，可以改为GPT-4的模型。

class class_openai
{
	const ROOT_URL = "https://api.openai.com/";
  
    //构造函数，获取Access Token
    public function __construct($apikey = NULL)
    {
        $this->apikey = $apikey;
    }

    //文字完成 上下文
    public function chat_completions_context($messages)
    {
        $field = array(
            "model"=>"gpt-3.5-turbo",
            // "temperature" => 0,
            // "stream" => true,
            "messages"=>$messages,
        );
        $url = self::ROOT_URL."v1/chat/completions";
        
        $response = $this->http_request($url, json_encode($field));
        $result = json_decode($response, true);
        return trim($result["choices"][0]["message"]["content"]);
    }

	//图片完成
    public function images_generations($prompt)
    {
        $field = array("prompt"=>$prompt,
                       "n"=>1,
                       "size"=>"256x256",
                      );
        $url = self::ROOT_URL."v1/images/generations";
        $response = $this->http_request($url, json_encode($field));
        $result = json_decode($response, true);
        return trim($result["data"][0]["url"]);
    }


    //HTTP请求（支持HTTP/HTTPS，支持GET/POST）
    protected function http_request($url, $data = null)
    {
        $headers = array(
            "Content-Type: application/json",
            "Authorization: Bearer " . $this->apikey
        );
        var_dump($url);
        var_dump($headers);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, 120);
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
        // curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        // curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
        if (!empty($data)){
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        }
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        $output = curl_exec($ch);
        curl_close($ch);
        return $output;

    }

}

二、调用方法

文本完成模型ChatGPT的调用方法如下：

$chat = new class_openai($apikey = "sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");

$prompt = "人生很痛苦，怎么办";
$messages = array(array('role' => "system", 'content' =>"你是专业的心理师"),
                  array('role' => "user", 'content' =>$prompt));
$result = $chat->chat_completions_context($messages);

$chat = new class_openai($apikey = "sk-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");

$prompt = "美女";
$result1 = $chat->images_generations($prompt);

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